package com.demo.mavendemo;

public class Calculator{  
	  
	private static int result; // 静态变量，用于存储运行结果  
	  
	public void add(int n){  
	  
	result = result + n;  
	  
	}  
	  
	public void substract(int n){  
	  
	result = result - 1; //Bug: 正确的应该是 result =result-n  
	  
	}  
	  
	public void multiply(int n){  
	  
	} // 此方法尚未写好  
	  
	public void divide(int n){  
	  
	result = result / n;  
	  
	}  
	  
	public void square(int n){  
	  
	result = n * n;  
	  
	}  
	  
	public void squareRoot(int n){  
	  
	for (; ;) ; //Bug : 死循环  
	  
	}  
	  
	public void clear(){ // 将结果清零  
	  
	result = 0;  
	  
	}  
	  
	public int getResult(){  
	  
	return result;  
	  
	}  
	  
	}  
